126,077 research outputs found
Active Audiences
No full textThe concept of the active audience has been one of the most fruitful and provocative ones in the field of media literacy as it has brought media educators to seriously question the traditional ways of defining both their students’ involvement with the media and the effects they supposedly produce on them
Media Literacy in Italy
No full textIn Italy, the media literacy (ML) movement has a long grassroots tradition. Main actors are from civil society (academics, associations, church communities, teachers, media professionals, educators), with some growing support from local and national institutions. While digital literacy has stably entered the school system through funds, projects, and teaching resources aimed at improving students' digital skills, only recently has a more sociocultural view of digital technologies developed, thanks also to the National Plan for Digital School issued by the Ministry of Education in 2015. For the future, more commitment to developing the following three important directions is needed: conducting evaluative research on ML in order to have more evidence‐based knowledge of its impact on educational contexts, both formal and nonformal; enhancing training and producing quality resources for teachers and educators alike; fostering more coordination and networking among the various stakeholders involved in the field
Critical Theory Applied to Media Literacy
No full textTraditionally, one of the fundamental objectives of media literacy (ML) has been the development of the ability to exercise critical thinking about the media, unmask their “naturalness,” and bring to surface their ideologies and values. However, when we move from the abstract level of critical theory to the messy and complex practices enacted in educational contexts, this broad political goal, along with its claim about the “liberating” and “empowering” effect of the critical mind, is flawed with limitations and contradictions. Although the need remains—and is as urgent and vital as ever—to develop critical skills and attitudes, it is also necessary to graft critical theory onto the learning processes activated in practice. As a result of this, ML can be redefined as a form of praxis whereby theory and practice nurture each other in dialectical ways and contribute together to the construction of active citizenship
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Spectral Composition of the Scattered Field from a Large Metallic Cloaked Cylinder
No full textAn analysis of the spectral content of the scattered field by metallic cylinders covered by homogeneous mantle cloak is performed. In particular, a theoretical approach based on Mie Theory is considered for the computation of the scattered field, which is examined in terms of radar cross-section and scattering coefficients. The values of surface impedance that lead to the minimum of the radar cross section are determined as a function of the cylinder radius normalized with respect to the frequency of operation and of the dielectric material characteristics. Furthermore, the spectral composition of the scattered field for this optimal condition is evaluated and compared with that of the bare cylinder case
Harmonic analysis and reduction of the scattered field from electrically large cloaked metallic cylinders
No full textIn this paper, an analysis of the spectral composition of the scattered field from coated metallic cylinders is performed, focusing particularly on the cloaking of electrically large structures. An expression of the scattering coefficients is derived, considering both a dielectric and a metasurface coating. Modeling the metasurface as a surface impedance boundary condition, the surface impedance, which annuls one harmonic of the scattered field, is formulated in a closed and compact form. Moreover, in the case of cylinders with radius comparable with the wavelength of interest, it is demonstrated that a reduction of the scattering is possible by using a homogeneous metasurface coating, which presents a positive surface reactance. In particular, a reduction of the scattering width of 4 dB is achieved for a cylinder radius of a = 0.917λ0
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
A radial transmission line model for mantle cloaking with impedance metasurfaces
No full textIn this work, the problem of reducing the scattering from conductive cylinders is reformulated by considering a matching problem with radial transmission lines. A unique compact closed-form solution for the surface impedance loads Z s (m,kb) above a cylindrical grounded dielectric substrate is found without any approximation as a function of the harmonic index m (scattering mode to suppress) and of the frequency regime kb (product of wavenumber k and radius b of the cloaked system). Possible implementations with a microstrip-line based metasurface are discussed and presented
Sei gradi di libertà: il lavoro libero come pratica inclusiva nell’approccio Montessori
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